Machinery for cutting- sandpaper



WILLIAM ADAMSON, OF PHILADELPHIA, PENNSYLVANIA.

MACHINERY FOR CUTTING- SANDPAPER.

Specification of Letters Patent No. 14,218, dated February 12, 1856.

T0 all whom t may concer/n.'

Be it known that I, VILLIAM ADAMsoN, of the county of Philadelphia andState of Pennsylvania, have invented a new and useful Improvement in theConstruction of Cutters and Slitters for Sandpaper-Machines; and I dohereby declare that the following is a full, clear, and eXactdescription of the same, reference being had to the annexed drawings,making a part of this speciticat-ion, in which- Figure 1 represents avertical longitudinal section of my improved cutt-ing and slittingmachine. Fig. 2 represents a detached view of my slitting cutters shownin transverse section. Fig. 3 represents a front view of my improvedrotating cutters showing the revolving cutter detached. Fig. 4represents a vertical section of my revolving cutter takenlongitudinally showing the manner in which the knives are attached.

Heretofore in the manufacture of said paper it has been customary tomake the sand paper in long sheets and to slit the same into therequired width and to cut it into the required lengths by means of largeshears or sliding knives. It had been found that revolving slitters orcutters when used for slitting or cutting sandpaper became rounded orbeveled at the edges in consequence of the gritty material in the paper,and soon ceased to cut at all.

My improvement consists in an arrangement of a pair of drums made ofthin metal the edges of which rotate at one point of their circumferencein contact and slitthe paper into the required width as it passes.

To enable others skilled in the art to make and use my improved slitterand cutter I proceed to describe its construction and operation.

Fig. 1 represents a longitudinal vertical section of my improved cutterand slitter.

C, represents a roll of sand paper.

A and B, represent the slitting drums. They are both alike and arecomposed of a thin steel blade bent around into the form of a drum andsecured on the hubs G and G as shown at A and B Fig. 2. Each slitter isabout four inches in diameter, about four inches broad, and aboutone-sixteenth of an inch thick. The slitter A is attached by the hub g gto the shaft IV WV and the slitter B is attached by the hub g g to theshaft y y. The shaft W W and the shaft Y Y are so arranged that the edgeof the upper part of the circumference of B shall just come in contactwith the edge of the lower part of the circumference of A at a singlepoint. The shafts W W and Y Y are supported at each extremity inbearings on the upright frame. The slitter B is secured in its place onthe shaft y y by the set screw 5, and the slitter A is kept up againstthe edge of B by the spiral spring S which presses against the fixedcollar F F the spring S thus forcing the lower edge of A. against theupper edge of B and preserving a contact between the cutting surfaces.The operation of this part of my improvement is as follows. As the paperunrolls from C in Fig. 1 it passes between A and B as shown at P I.These cutters A and B are placed so that the cutting edge shall be inthe middle of the width of the passing paper P P.

The paper passes between two drawing rollers D and E which drag it alongbetween the slitters A and B. These slitters slit the paper as it passesbetween them, the effect being similar to the action of a pair ofshears. The grit in the paper wears the edges away and would tend tomake them uneven, but these edges by grinding constantly against eachother are kept always smooth and square. As fast as these edges wearaway, the spring S s forces the edge of the slitter A up against B andpreserves the cutting action until the whole of the drum is worn down,which I have found will not take place until the machine has slit 2500reams of paper. It will be seen that these slitters grind themselves andpreserve a square edge and, therefore, do not need any sharpening orrepair. These slitting drums are moved by ordinary cog or belt gearing.

My improvement is applicable to machinery for cutting emery paper, emerycloth, enameled cards, bristol boards, and any similar material of agritty nature as well as wet or damp paper.

Having thus described my improvements what I claim and desire to secureby Letters Patent is- The arrangement and combination of the slittingdrums A and B in the manner and for the purpose substantially as isherein set forth.

WM. ADAMSON.

Witnesses:

J. E. SHAW, CHARLES D. FREEMAN.

